Tierney, who spent years as the backbone of NBC's 'ER,' first started turning heads on NBC's sitcom 'NewsRadio.' The versatile actress guest stars on the Dec. 1 episode of 'The Office' (9PM ET on NBC).
In the episode, 'Mrs. California,' Tierney plays Mrs. California, wife to James Spader's character, Robert California. Robert brings her into the office to try and find her a job. Later in the episode Dwight opens a gym in the building.
Take a peek at some photos below.
Tierney recently starred in the short-lived ABC series 'The Whole Truth' and in FX's 'Rescue Me.'